I understand the annoiance when opponent plays this and avoids your hazards being really effective in slowing him down, but I don't agree with the analysis that it would be too strong. Strong decks, i.e. tourney-winning decks, don't use aCM or WhCtK alot I think, for reasons of speed/cardmanagement, because they squat and play chars easily at the site/haven with avatar, because it's better to avoid trouble at all, etc.It's not meant so much to solve a problem as to dampen a strategy that is a bit too strong.
Obviously these cards are loved for versatility, but in my experience, included in deck mainly because it's a pain playing chars when your in the wild and/or your avatar is elsewhere. In fact, if I have WhCtK and a char in org.phase, I would not generally hold on to it until site phase, I'd rather draw cards and use the guy during movement(generally speaking of course), so this only applies to cases where you draw into either one card.
And the UEP should only be used parsimoniously for weakening strategies and making plays impossible, right? To me, this doesn't qualify as a serious problem.
Added to that, it would render it useless imho as a staple support card, if I have to boost DI first before being able to play WhCtK.